新不列颠海沟轴部沉积物的放射性核素分布  

Distribution of radionuclides in sediment columns from the axis of the New Britain Trench

作　　者：孙诗晴 张芬芬[1] 王亚松 许云平 杜金洲[1] SUN Shiqing;ZHANG Fenfen;WANG Yasong;XU Yunping;DU Jinzhou(State Key Laboratory of Coastal and Estuary Research,East China Normal University,Shanghai 200241,China;Hadal Science and Technology Research Center,College of Oceanography&Ecological Science,Shanghai Ocean University,Shanghai 201306,China)

机构地区：[1]华东师范大学河口海岸国家重点实验室,上海200241 [2]上海海洋大学海洋科学与生态环境学院深渊生物圈前沿科学研究基地,上海201306

出　　处：《海洋环境科学》2025年第1期47-58,共12页Marine Environmental Science

基　　金：河口海岸学国家重点实验室开放基金项目(SKLEC-KF202108);国家自然科学基金项目(42276033)。

摘　　要：深渊海沟是深海中重要且特殊的漏斗型地貌区域,多年来一直被认为是深海“荒漠”。近年的研究表明,深渊海沟区域不仅是深海沉积物的汇,也存在着活跃的深渊生态系统,并且是深海有机碳发生埋藏的重要场所。本文对采集于新不列颠海沟轴部的沉积物短柱样进行实验分析,利用天然放射性核素(^(210)Pbex、^(226)Ra、^(238)U、^(232)Th和^(40)K)和环境磁学等参数在柱样中的分布情况判断沉积物来源,结合TOC、δ^(13)C参数进一步识别沉积物中陆源有机质的来源并计算贡献比例。结果表明,新不列颠海沟轴部沉积物的来源主要受陆源、火山活动、碳酸岩溶洞三种物源控制,另外,顶部样品受到一定程度的人类活动影响。The abyssal trench is an important and special funnel-shaped landform area in the deep sea,which has been regarded as the“desert”for many years.Recent studies have revealed that the abyssal trench area is not only a sink of deep-sea sediments,but also has an active abyssal ecosystem,and an important site for the burial of deep-sea organic carbon.This article conducts experimental analysis on sediment short column samples collected from the axis of the New Britain Trench.The distribution of natural radioactive nuclides(^(210)Pbex,^(226)Ra,^(238)U,^(232)Th,and^(40)K)and environmental magnetism parameters in the column samples are used to determine the source of the sediments,and TOC is combined withδ^(13)C parameter to further identify the source of organic matters in sediments and to calculate the contribution ratio.The research results indicate that the sources of sediment in the axis of the New British Trench are mainly controlled by three sources:terrestrial,volcanic,and carbonate caves.Secondly,the top samples are influenced to some extent by human activities.

关 键 词：深渊海沟 放射性核素 物源分析 δ^(13)C 

分 类 号：P736[天文地球—海洋地质] X142[天文地球—海洋科学]